ASF GitHub Bot commented on FLINK-6068:

Github user twalthr commented on the issue:

    I think we've already had the discussion about naming the if. We can add 
it, but we should also update the documentation about the alternative syntax 
for Java.

> Support If() as a built-in function of TableAPI
> -----------------------------------------------
>                 Key: FLINK-6068
>                 URL: https://issues.apache.org/jira/browse/FLINK-6068
>             Project: Flink
>          Issue Type: Improvement
>            Reporter: Zhuoluo Yang
>            Assignee: Zhuoluo Yang
> Most sql system support if() as a built-in udf. However, we didn't register 
> the if() in the function category. A great many of our users use syntax 
> 'if(a, b, c)'. Also most sql systems support 'if(a, b, c)' syntax.
> Mysql: 
> https://dev.mysql.com/doc/refman/5.7/en/control-flow-functions.html#function_if
> Hive: 
> https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF#LanguageManualUDF-ConditionalFunctions

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